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J.J. HOYT.

CASE PoR PRBSERVING Pom).4 No. 296,692. A' i Patented Apr. 8, 1884.

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JONATHAN J. HOYT, OF CHELMSFORD, MASSACHUSETTS, ASSGNOR TO EDWARD F. RICHARDSON, OF SAME PLACE.

OASE FOR PRESERVING FOOD.

SPECIFICATION forming part of Letters Patent No. 296,692, dated April 8, 1884.

Application filed I-`ebruar5` 21, 1833.

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Be it known that l, JONATHAN J. Herr, a citizen of the United States, residing at Chelmsford, in the county of' Middlesex and Commonwealth of' Massachusetts, have invented certain new and useful Improvements in Cases for Preserving Food,.oi` which the followingis a specification.

My invention relates to means for guiding the cover while being ground, and to means for securing the cover upon the case.

The accompanying drawing` is avertical orosssection through the center of all the parts described. Y

A is a cylindrical glass case, preferably of pressed glass, to secure uniform thickness of' the walls and smoothness on the inside, and to avoid the sinking of a screw-thread ou the inside of the glass corresponding to the thread A2,which inner thread,besides being of no use,

would make it more difficult to remove they contents of the oase when the contents were butter, lard, or articles of' similar consistency and would also make trouble in cleaning the case. Inside, the case is slightly larger at the top than at the bottom, to enable the plunger of the mold, in which the case is pressed, to be removed from the case, and this construction enables the contents of the case to be more easily removed. The case at the top is provided with an annular flange, A', and imniediately below this flange is provided also with ascrew-thread, A",which projects out from the ease to a less distance than the ange projects. The cover B is a circular glass plate, having a diameter equal to the largest diameter of the flange A', and the top of' the flange and the bottom of the 'cover are ground together by any usual means, the cover being guided on the casein the operation of grinding by the ring C. The ring C is passed up around the case from the bottom of the sameandhas a screw-thread,

G2, which takes into the thread A2 on the case A, and holds said ring C, or rather the shoulder G on said ring, up against the under side of' the flange A. Above the shoulder C the ring C is enlarged and runs up straight above the flange A and above the cover B, and is provided with an internal screw-thread, G3, from the top of said ring C down to a point below (No model.)

the top of' the cover. Another ring, D, is provided with an external screw-th read, Dwhich takes into the thread Os of' the ring C, so that the ring D may be turned down upon the top of' the Acover to hold the latter firmly against the top of the case, or upon the top of anyv packing that may be interposed between said cover and ease, the thread C" extending` down low enough to allow the ring D to be turned against the cover, even if the cover is thinner than intended to be. The lower thread, C, of the ring C is coarse, (about four threads to the inch,) to adjust said ring Gquicklyto place, while the threads Cs and Di are fine, (about twenty threads to the inch, to give great power, the last-named threads C3 D3 being finer than could be made upon the glass case.

I prefer to make the ring D with an internal flange, D,which entends in toward the center of the cover f'ar enough to give sufficient bearing-surface for the ring D, and thus to lessen the danger of breaking the edges of the glass cover. An external annular flange, D`z,on the top of the ring D entends beyond the ring C, and may be milled to assisty in turning said ring D up or down, to open or close the case. The cover is provided at or near the center with a conical hole or valve-seat, F, into which is inserted a conical glass valve, E, provided with a central opening lled by a plug, E,(of` wood or metal,) having a threaded hole, E2, into which a screw-pointed instrument may be inserted to draw the valve out of its seat. Said valve-seat and valve, being described in another application for a patent made by me and now pending, are not claimed herein, except in combination with the case and cover, having their joining surfaces ground together. The valve and valve-seat are ground together as described in the application referred to.

Instead of an elastic gasket between the top of the case and' the cover, l use a packing of refined soft parafiinewax, which l barely melt and apply with a brush, sponge, or cloth to the I have found by experiment that an air-tight 5 joint cannot be made by pouring melted paraffine-wax into a channel or opening between the cover and case, because when thus applied the wax shrinks on cooling and admits the air. The packing described is clean and cheap. The air is extracted from thecase through the central opening in the cover, so that food may be put up cold in this jar, the means of ex tracting the air being an air-pump or a vacuum produced by steam. After the air is exhausted from the case, I cover the top of the valve and the projection with soft refined paranewax, applied as above described, and lay thereon a piece of paper saturated with parafiine wax. I protect the glass case and cover from breakage by a box, G, having a body, G, of pasteboard or equivalent material, saturated with hard parafine-waxxto exclude moisture from the pasteboard, and thereby prevent its becoming soft,) and having wooden ends I I. These ends are made of wood to resist wear and for cheapness. vided with a recess, R, circular in form, to receive and hold the lower end of the case in the center o f the box.

In the center of the central recess, R, is a depression, S, which lightens the box, and also allows the case to stand vertically in the box, when the bottom of the case has fallen or bulged downward from having been taken from the mold when too hot. This construction of the box allows the weight of boxes and cases, piled one above another, to rest on the vertical walls of the cases, instead of on the nearly horizontal and frequently uneven bottoms of the cases. The top outer corner of the bottom is recessed at T to receive the lower end of the pasteboard G, which forms the sides of the box proper, the pasteboard being secured to the wood by brads and glue. The sides of the cover proper The lower end, I, is proare fastened to the upper end of the box in the same manner as the sides of the box proper are fastened to the bottom thereof. The upper end is recessed to admit the ring D, and rests only upon the flange D, being hollowed out centrally at D5, so as merely to touch lightly the paper on the top of the valve.

It will be seen that the cover of the box is held centrally on the case by the projecting parts of said cover lying within and filling the vertical part of the ring D7 and that the Weight of cases and boxes piled one above another rests upon the ring D above the vertical walls of the case A, instead of upon the central un-4 supported parts of the cover B, and that the case cannot move sidewise in the box.

- I claim as my invention l. Thecombination of the case provided with an external screw-thread and a ring extending vertically above said case and having an internal screw-thread engaging with the thread upon said ease to guide the cover when being` ground, as herein described.

2. The combination of the case A, provided with a screw-thread, A2, the ring C, provided with screw-threads C2 C3, the cover B, and the ring D, provided with the screw-thread D3, as and for the purpose specified.

3. The combination of the case A, provided with the screw-thread A2 and iiange A', the ring C, provided with the screw-threads C2 (li and the shoulder G, the cover B, and the ring D, provided with a screw-thread, D, as and for the purpose speciied.

4. The combination of the case A, provided with the screw-thread A2, the ring C, provided with screw-threads C2 C3, the cover B, and the ring D, provided with the screw-thread D3 and ilange D', as and for the purpose specified.

JONATHAN J. HOYT.

Witnesses:

ALBERT M. Moenia, IRvING S. PORTER. 

